PlainVitamins

NK Cell Activator

by Life Extension · tablet or pill · 30 vegetarian tablets

  • On the market (NIH)
  • UPC 7 37870 19033 2
  • DSLD label 328601
  • Serving 1 vegetarian tablet
  • 30 servings

NK Cell Activator by Life Extension lists one ingredient: 500 mg of proprietary enzymatically modified rice bran per serving of 1 vegetarian tablet. Its current label entered the NIH Dietary Supplement Label Database on June 25, 2025.

What is in NK Cell Activator?

Each row as the label prints it, per serving of 1 vegetarian tablet. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

NK Cell Activator: Supplement Facts rows against the market (DSLD label 328601, January 2026 release)
IngredientAmount% DVAmong products listing it
Proprietary Enzymatically Modified Rice Bran500 mgRice Bran in NK Cell Activator against 115 products500 mg per serving; the middle half of products list 90 mg to 500 mg, the median 200 mg.500 mg

Higher than 70% of 115 products listing rice bran (median 200 mg). Per day at the most servings: 1,000 mg.

Source: NIH ODS Dietary Supplement Label Database, label 328601 (entered June 25, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.

The NIH database records 1 to 2 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

2 products list the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Directions: Take one (1) tablet once or twice daily with food, or as recommended by a healthcare practitioner.
Warnings
Read the entire label and follow the directions carefully prior to use.
Warnings: Keep out of reach of children.
Do not exceed recommended dose. Do not purchase if outer seal is broken or damaged.
When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.
Contains wheat.
To report a serious adverse event or obtain product information, contact 1-866-280-2852.
Allergens and what it does not contain
Gluten free Non GMO LE Certified
Storage
Store tightly closed in a cool, dry place.

Source: label statements in DSLD label 328601.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Maltodextrin, Dicalcium Phosphate, Croscarmellose Sodium, Stearic Acid, Silica, Hydroxypropyl Cellulose, Hydroxypropyl Methylcellulose, Glycerin, Stearate.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Non GMO LE Certified.

How many labels does NK Cell Activator have?

5 labels are on file under this name since June 24, 2016: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 328601 (current) Entered June 25, 2025 · on the market · 30 vegetarian tablets · UPC 7 37870 19033 2
  2. Label 232454 Entered August 23, 2020 · off the market July 14, 2020 · 30 vegetarian tablets · UPC 7 37870 19033 2
  3. Label 232081 Entered August 23, 2020 · on the market · 30 vegetarian tablets · UPC 7 37870 19033 2
  4. Label 60667 Entered June 24, 2016 · off the market July 14, 2020 · 30 vegetarian tablets · UPC 7 37870 19033 2
  5. Label 60665 Entered June 24, 2016 · off the market December 15, 2015 · 30 vegetarian tablets · UPC 7 37870 19033 2

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Quality Supplements and Vitamins, Inc. (distributor), Ft. Lauderdale, FL. All Life Extension products.

Where next?